Shears sharpening machine



March 22, 1938. w. A. MINI SHEARS SHARPENING MACHINE Filed Feb. I7, 1936 fnveniar W7 A Jizvt Patented Mar. 22, 1938 UNITED STATES PATENV sis This invention relates to improvements in shears sharpening machines. One object is: to

provide a sharpener adapted for very general use so that barbers, tailors, seamstresses, and others using shears may, at very low cost and with very little effort, be provided with means for keeping their shears in proper working order.

A further object is to provide a shears sharpening machine having shears positioning means for automatically positioning the blade to be sharpened in just the proper relation to the sharpening or grinding wheel so that a proper cutting edge is assured.

More specifically the invention includes a stationary frame and a relatively movable frame secured thereto, said stationary frame being adapted to carry the shears under operation and the movable or adjustable frame carrying the grinding wheel which is thereby yieldingly retained in contact with, or in closest proximity to, the stationary frame so that when the shears are in position in the last named frame they are yieldingly in contact with the grinding wheel.

In the drawing:

Fig. 1 is a plan view of the sharpening machine illustrating its application.

Fig. 2 is a view of Fig. 1 in elevation.

Fig. 3 is a view of the sharpening machine secured to a bench or table.

Like reference characters denote corresponding parts throughout the several views.

The reference numeral l denotes the stationary frame made integral with the depending clamp 2, the lower jaw thereof carrying the screw 3, said clamp being used to secure the frame to a bench or support 4. The frame I is formed at its lower corners with the spaced parallel ears 5, 5 through which the oscillating shaft 6 extends, the ends thereof being fast in the ears I, l of the movable 0 frame 8, said ears 1, 1 being contiguous to the ears Rising from one corner of the movable frame is the arm I 0 formed with an enlarged perforated end receiving one end of the stationary shaft H,

said shaft extending into the large screw shaft l2 that is received into the interiorly threaded sleeve 13 formed at the upper end of the arm I 4 arranged at the opposite corner of the frame 8 with respect to the arm in. The stationary shaft l l extends from the arm I!) to the sleeve l3 and terminates within said members, the screw shaft traveling back and forth through the sleeve l3, over the shaft II, as it is rotated by means of its S-shaped handle I5 at one end thereof, said handle being provided with the hand grip [6.

Fast to one end of the traveling screw shaft is the grinding wheel H. A shoulder I8 is formed upon the arm M in the path of movement of the grinding wheel which serves as a stop for the same marking the end of its movement in one direction. The movable frame 8 includes a longitudinal rib [9 through which one end of a coil spring 20 extends that is wound about the oscillating shaft 6, the opposite end of said spring being disposed in a slight recess 2| formed in the lower edge of the frame I, said spring serving yieldingly to force the upper non-pivoted edge of the movable frame toward the stationary frame. Extending through a threaded perforation in the frame I is the adjusting screw 22 adapted for actuating engagement with the rib l9 of the movable frame 8 whereby to space the same from the stationary frame, as desired, to permit insertion of the blade or Work.

The frame I terminates at its upper end in the ledge or table 23 beveled downwardly and forwardly to receive a blade of the shears 24 to be ground or sharpened, the fiat side of the blade being disposed upon the table with the cutting edge disposed toward the grinding wheel. The table 23 is formed with two slightly elongated recesses 25, each recess being adapted to removably receive the flattened end of a substantially U-shaped inverted steel wire gauge 26, the opposite end thereof extending slightly beyond the forward edge of the table 23, said gauges being spaced apart substantially and in line with each other to receive the blade to be sharpened, said gauges positioning the blade with respect to the grinding wheel.

The flattened ends of the gauges prevent them from oscillating in their recesses 25 while receiving the shear blade. The blade being sharpened is inserted through the gauges along the table, 7

as clearly shown in Fig. 1, until the edges of the blade contact the sides of the U-shaped gauges. The blade is then in proper position. The inverted trough-shaped clamps 21, through which the screws 28 extend into threaded recesses in the table, are now applied to the blade and secured in position by means of said screws, one end of each clamp contacting directly with the beveled face of the blade and one end contacting with the table and the inverted base portion of each clamp riding against the thickest portion of the blade, as shown in Figs. 1 and 3 clearly. The gauges 26 are now removed and the blade held only by the said clamps and screws. Previous to the insertion of the blade in the gauges the screw 22 has been moved against the rib H) to force the frames 1 8 apart sufliciently to facilitate this blade movement. The screw 22 is now retracted out of engagement with the rib H! of the frame 8 to permit the grinding wheel to contact with the shear blade.

By now rotating the handle l5 the screw shaft I2 will be caused to travel through the sleeve l3 with the grinding wheel in sharpening engagement with the blade. It will be noted that the table 23 is positioned slightly below the shaft I I thus disposing the center of the grinding wheel above the free edge of the table and just slightly above the blade being sharpened. As the grinding wheel is now rotated the blade is encountered in a manner and at an angle to sharpen it properly. The screw shaft is rotated back and forth to cause the grinding wheel to travel first in one direction and then in the other over the blade edge.

I am aware that numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not desire to limit the patent granted hereon otherwise than necessitated by the prior art.

What is claimed is:--

In shears sharpening machines, a stationary frame having a downwardly and forwardly extending table portion, a clamp carried by said frame, work gauges carried by said table portion, a movable frame, an oscillating shaft connecting said frames, a stationary shaft carried by said movable frame, a screw shaft carried by said movable frame for movement over said stationary shaft, a grinding wheel carried by said screw shaft, a spring carried by said oscillating shaft with its ends connecting said frames together, and an adjusting screw carried by said stationary frame for engagement with said movable frame.

WILLIAM ARNOLD MINI. 

